Which of the following is NOT a part of the endomembrane system? MCQ with Answer and Explanation

Explanation:
The corpus callosum is the largest white matter structure in the brain, consisting of over 200 million axons. It forms a broad, flat band located deep in the longitudinal fissure (the cleft between the two hemispheres). Its primary function is to serve as the main communication pathway, allowing the left and right cerebral hemispheres to share information, coordinate activities, and integrate sensory, motor, and cognitive functions.

Explanation:
Double fertilization is a unique feature of angiosperms. One male gamete fuses with the egg cell to form the diploid zygote (syngamy), which develops into the embryo. The second male gamete fuses with the diploid secondary nucleus (polar nuclei) of the central cell to form the triploid Primary Endosperm Nucleus (PEN), which develops into the endosperm.

Explanation:
During photosynthesis, water is split (photolysis), releasing oxygen as a byproduct. Respiration consumes oxygen, nitrogen fixation uses nitrogenase, transpiration releases water vapor.